JavaScript declares the syntax rules for variable names _javascript tips

Source: Internet
Author: User

I. Rules of grammar

1. The variable must begin with a letter, an underscore (_), or a dollar character ($).

2. You can then use any number of English letters, numbers, underscores (_) or dollar characters ($) to make up.

3. Can not use JS keywords and reserved words.

Second, the example

VAR score;
score= "100";

Third, attention

1.JS is case-sensitive. such as variable score and score are not the same, quite two variables.

2. Although variables can not be declared, direct use, but not specification, will involve variable name promotion and so on.

The above mentioned is the entire content of this article, I hope you can enjoy.

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